TEST BEAM RESULTS OF LEAD TUNGSTATE MATRICES

Different Lead Tungstate matrices with Avalanche PhotoDiode readout ha ve been tested in electron and pion beam at CERN. In the H4 beam, a 7x 7 crystal matrix response has been studied with electrons of 15 to 150 GeV. Crystals (about 23 cm long and pointing shape) came from differe nt producers. An energy resolution of about 0.6% at 100 GeV has been o btained. On the other hand, a 3x3 crystals matrix equiped with the fir st prototype of a complete electronic readout chain (fast shaping, ful l dynamic range) has been tested in the X3 beam.